Machinist&#39;s gage.



Patented June 26, I9OUI.

.1. P. PRATT.

MACHINISTS GAGE.

(Application filed Mar. 7, 1900.)

No. 652,52I.

(No Model.)

WITNESSES wq THE NOFIFIIS PETER5 CO PNDYO LITNQ ASHINGTON D C nvvE/vrol W 5o oblong, as indicated, and having a plane un- 'NITED' rates I much.

ATlENT MACHINISTS GAGE;

SPECIFICATION forming part of Letters Patent No. 652,521, dated June 26, 1900.

Application filed Ma h '7, 1900.

To all whom it may concern.-

Be it known that I, JOHN I. PRATT, a citizen of the United States, residing at Milford, in the county of Worcester and State of Massachusetts, have invented certain new and useful Improvements in Machinists Gages; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to that class of devices commonly called machinists gages and employed by machinists and others for gaging, testing, and measuring various kinds of work.

The object of my said invention is to provide or produce asimple, cheap, and efficient implement which shall embody in one structure a scratch-gage, surface-gage, depth or shoulder gage, height-gage, and micrometer measure-gage, each being complete in itself, one not interfering with another, and yet all or any capable of cooperative or conjunctive use, taking their measurements or distances from the face of their common base. To accomplish all of this and to secure other and further advantages in the matters of construction, operation, and use, my improve ments involve certain new and useful arrangements or combinations of parts and peculiarities of construction, as will be herein first fully described and then pointed out in the claims.

In the accompanying drawings, forming part of this specification, Figure l is an elevation of my improved gage, showing the longer side of the base or bottom; and Fig. 2 a similar view showing the end of the base, the adjustable parts in the figures being differently located to indicate in a small measure their capabilities of adjustment. Fig. 3 is a plan of the underside of the base, showing the recess therein for accommodatingthe scratch-pin.

In all the figures like letters of reference wherever they occur indicate corresponding parts.

A is the base-pieceof the implement, made der or bearing face. The ends, and sides of the base should be formed at right angles with Serial No. Z642. (No model.)

each other and vertical with respect to the lower surface, so that the implement maybe accurately located for use in any position required and returned to that position with precision whenever necessary.

Upon base A is cast or otherwise fixed ahub B, which serves as a seating for the main standard or column 0 and for other purposes. Standard 0 is of any required length, is exteriorly round and interiorly hollow to accommodate the spindle of the scratch-gage andallow the same to move therein, and is accurately and firmly seated so that its axis shall remain at right angles with the lower face of the base. The various arms employed are each movable up or down upon-standard O and each capable of revolution therearound, each being supplied with a suitable set-screw or clamping-screw to maintain it in any position to which it may be adjusted upon the standard or column.

The surface-gage arm D carries a scratchpoint rod D, which may be adjusted back or forth or rotated in its seating in the end of the arm and thereheld bya small clampingscrew cl. This arm is movable upon the column, as above explained, and is held adjustably in place by its set-screw (2. Being thus arranged and mounted it affords a surfacegage of general applicability and may be employed either with or without the other parts.

E'is the adjustable arm for the height-gage. It is mountedupon the column same as the other arms and sustains at its outer end an adjustable rod E, capable of vertical movement within its arm and held therein by setscrew e, the arm being also supplied with a set-screw e, by which it may be adjusted in position upon the column. This affords means for gaging the height of any point of the work above the lower face of the base and may be used separately orconjoiutly with other parts, as desired. The rod E is preferably plain and smooth, so that it may slide in its bearing; but obviously it might be otherwise made adjustable therein if preferred, as by forming it like a screw or like a rack to be moved by a pinion.

The measuring-gage is'sustained upon column O in an arm F, also capable of rotation and vertical adjustment. Seated in the outer end of this arm F is the measuring-screw or semi f, immovably fixed upon the screw. The arm F carries a graduated scale f with which the disk f registers, the two constituting a micrometer by which the distance of the point of the screw from the plane of the base-facemay be accurately measured, as will be readily understood. This affords means for measuring the height of any point of the work or indicating the height to which any point should be brought, and it may be used with or without the other parts or either of them. By swinging or rotating the arm F upon thecolumn C its outer end, and with it the screw F, may be brought beyond the periphery of the base, whereby the tip of said screw can be used to measure distances from said periphery laterally aswell as vertical heights above the plane of the upper face of the base.

G is the rod or spindle of the scratch-gage, the same being movable up and down Within the hollow column 0 and in no way interfering with the required movements of the arms mounted on the exterior of said column. At its lower end this spindle carries a suitable form of laterally-projectin g scratch-point, as g, and a thumb-screw g, seated in the hub B, reaches through column 0, so as to bear against spindle G and lock the same in any position to which it may be moved. The

lower face of base A is suitably recessed, as

l and H, pass through hub B and through plate A and-are held in place by set-screws, as h and it, these pins being employed for depthgages or shoulder-gages, and they may be used together or separately as the nature of the work may demand, and they may be used with or without the other elements, as will be apparent.

The relative arrangement or location of the arms upon the column may be varied at pleasure, they being each removable and alike adjustable;

The improved implement constitutes a practically-universal gage and is well adapted to answer all the purposes or objects of the invention previously set forth. The height tained by the appropriate elements of the device, these elements may be fixed in position and the tool then employed as a test-gage and marker, as will be understood by'those ac' customed to the use of gages for mechanical work.

Having now fully described my invention, what I claim as new herein, and desire to secure by Letters Patent, is-

1. In a gage of the character herein set forth, the combination with a base, a hub, and a column, all rigidly connected and pierced with a continuous opening; of a rod adjustable longitudinally through said open ing, a point on this rod adapted to be set at various distances from the bottom of the base,

a series of arms adjustable around and upon,

said column, and a series of rods adjustable individually in the arms with respect to thedistance of theiroperative ends from various parts of the base, substantially as shown and described.

2. In a gage of the character herein set forth, the combination with a base, a hub, and a column, all rigidly connected and pierced with a continuous opening; of a scratch-gage spindle passing longitudinally through said opening, a thumb-nut in the hub against such spindle, a scratch-point at the lower end of the spindle, a series of arms surrounding and adjustable upon said column, and a series of rods adjustable in the arms with respect to the distance of their operative ends from said base, substantially as shown and described.

3. In a gage of the character herein set forth, the combination with the base, .a hollow column rising therefrom, and a spindle adjustable within said column and having a point; of an arm adjustable upon the exteriorof said column, arod adjustable through the arm so as to bring its operative end into various positions with respect to the base, an

indicating-disk on said rod, and a scale fixed upon said arm and standing adjacent the disk, substantially as shown and described.

4. In a 'gage of the character herein set forth, the combination with the oblong base,

a column rising from near one end thereof,

fan arm adjustable vertically on and laterally around the column, and a graduated scale rising fixedly from the arm; of a rod parallel with the scale and threaded through the arm so as to bring its point into various positions ,with respect to the upper face of the base, or, iwhen said arm is swung on the column, with respect to'the edge of the base, .and an indicating-disk fixed on this rod and movingadljacent said scale, substantially as shown and described.

In testimony whereof I have aifixed my-signature in presence of two witnesses. or depth or distance of any point of the work from a given line having been suitably ascer- JOHN P. PRATT.

Witnesses:

WENDELL WILLIAMS, LEVI W. MOORE.

IIO 

